| http://www.w3.org/ns/prov#value | - l or 1-benzotriazolyl, the latter yielding a water soluble leaving group) or an anhydride (--C(???O)OC(???O)R, wherein R is a group such as aryl or alkyl, which leaves in the acid form when reacted with the amino group) or an acid halide (--C(???O)X, wherein X is halide such as Cl, Br, or I, preferably Cl) which yield an amide linkage (--NH--C(???O)--); and an amino group (--NH2) and an isocyanato
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